Siemens RAA 22 Roomstat need help wiring

[amki1]

I have a Baxi SOLO boiler in a y plan, have Honeywell programmer on the system but I need help to wire Siemens RAA 22 with 2 wire into it.
Can some one please help. I am stuck!!

 

[stem]

Hello amki1 and welcome to the forum.

If the new Siemens roomstat is replacing an existing roomstat, it is the details of the existing roomstat and the wiring going to it that we will need not the programmer.

If you don't have a roomstat now, and wish to add one, then we will need more details of the Honeywell programmer. For example the model number, and a photo of the existing wiring going to its terminals would be useful.

Also, I can't find any details on a Siemens RAA 22, do you mean a RAA 20?

 

[amki1]

Hi stern
Thanks very much for your help.
The programer is Honeywell ST699B1002 White ST699 1 Day Classic Time Control Programmer
The wiring doesnt make sense and is a mess! But if helps I can take a picture and send it to you.
The Roomstat as you rightly said is Siemens RAA 20 and has two wire going into it.
I hope you can help and once again thanks.

 

[stem]

It shouldn't be too difficult, but you worry me a bit by saying the wiring is a mess!

Do you have an existing room thermostat? If you do, it is a photo of the wiring connections to that we need.

 

[amki1]

Hi stern,
Thanks for coming back to me.

What I meant about the wiring is hat they are not numbered so it wouldn't make sense to go by numbers or by photo. I can send you the picture if that helps.
This is a new room stat so there Is no old one to show you the wiring.

 

[doitall]

Post a clear pic of the wiring center.

 

[amki1]

Hi doitall
Thanks mate,

Is that the wiring in the ironing cupboard or the box downstairs by the boiler which one shall I do?

 

[doitall]

In the cylinder cupboard normally somewhere near the Motorized valve.

If you have a Y plan you should have a room stat to go with the valve above.

 

[amki1]

Hi doitall,

Yes I have a Y plan with the Honeywell programer but as you know trying to connect a Siemens RAA 20 Roomstat to it.

Just need the wiring as this is a 2 wire room stat. I know it seems to be easier but excuse my ignorancy!

 

[doitall]

Thats why you need to post the pics showing the existing.

 

[stem]

As there isn't an existing room thermostat, for you to DIY install one, the easiest way would probably be via the programmer. Below is a sketch showing how to incorporate it. The other wires are not shown as you don't need to alter them.

Untitled

• stem
• 28 Jan 2013
• 1

 

[amki1]

Hi Stem,

Many many any thanks for your help you are a life saver.

I can see the wire going to the programmer but can not see where the other wire going the writing is not clear, I do appreciate if you could send it again to see if is more clearer.

Thanks again.

 

[hazetimesfive]

it goes to the boiler

 

[stem]

I have a Baxi SOLO boiler in a Y plan

So the wire in question will presently go to the white wire of the motorised valve, not the boiler.

 

[hazetimesfive]

to the boiler... via the motorised valve ))))